Ammonia-compressor



G. HILGER. AMMONIA coMPREssER.

APPLICATION FILED'NOV. 26.19l9.

1,354,190. Ptendsept. 28,1920.

' F161 FTQ'. 2,

tion.

UNITED STATES PATENT OFFICE.

GEORGE HILGER, or cHIcAedTLLTNoTs.

' AMMONIA-COMPRESSOR.

Illinois, have invented certain new and useful Improvements in Ammonia-Compressors, of which the following is a specifica- The invention relates in general to ammonla compressors, and has for its aim the provlsion of a combined safety head and discharge valve of an improved character.

`More specifically stated, the principal object of the invention is to provide a combined safety head and discharge valve of a very practical character, embodying features of construction which make it extremely simple and durable and also eliminate such parts as bolts, screws, nuts and springs which are apt to work loose or become disarranged.

The object of the invention thus set forth, together with other and ancillary advantages, may be attained by the construction and arrangement illustrated in the accompanying drawings forming part hereof; but it is understood that the invention is not intended to be limited to the precise construction particularly set. forth herein.

In the drawings, Figure 1 is a vertical central section through one cylinder of an ammonia compressor, equipped with my improved safety head and discharge valve.

Fig. 2 is a bottom plan view of the safety head. Fig. 3 is a perspective view of one of the plugs employed in the discharge ports of the safety head for the purpose 'of minimizing clearance.

As thus illustrated in the drawings, the invention comprises a hollow or cup-shaped member 7 forming the safety head fitting neatly within a chamber 8 provided in the upper end of a cylinder 9, the latter being closed by means of a head or cap 9a. The

cylinder 9 is provided with an intake port 10 and the chamber 8 with an exhaust port 11, and communication between the cylinder and the exhaust port around the head is normally cut olf, while the passage of fluid from the cylinder is permitted in the normal operation of the compressor by a series of ports 12 controlled by a valve disk 13. Said disk is carried by the head and clamped in position therein bv means of a member 14 between which and the cap 9 of the cylinder Patented Sept. 2S, 1.920.

Application filed November 26, 1919. Serial No. 340,747.

bears a compression spring 15. Communication between the interior of the head and .the exhaust port 11 is established by means of a series of radial ports 16 and an annular groove 17 formed in the periphery of the head.

The cylinder 9 may be of any preferred construction, being Vherein shown as provided with a water jacket 18; andthe ca 9a mayy be secured in position upon the cy inder by any suitable and well known means. The chamber 8 for the safety head and valve is herein shown as cylindrical in shape, beL ing made of a diameter slightly greater than that of the cylinder bore 19. The bore forming thev chamber 8 thus forms with the cylinder bore 19 a shoulder 20 which is down wardly and inwardly beveled to provide a conical seat for the head 7. rI `he latter for thids purposeis similarly shaped at its lower en l The exhaust port 11 is located just above the seat 20 for the safety head, and in the normal position of the latter the. annular groove 17 into which the radial ports 16 lead is disposed directly opposite the exhaust port 11. The discharge ports 11 in the lower end wall of the head 7 are circumferentially arranged so that they all may be controlled by the single valve disk 13. The' latter is made resilient being preferably of spring steel so that in the upward or compressing stroke of the piston (not shown) the valve disk will yield to permit the flow of compressed fluid through the ports 12 and thence by way of the ports 16 and groove 17 into the exhaust port 11.

The member 14 for clamping the disk 13 in position in the head 7 is shaped at its lower end to permit such yielding of the valve disk 13. Thus the lower face of the member is slightly cone-shaped and at its center is provided with a stud or boss 21 Awhich is entered through a central aperture Aeo the upper end of which bears against the inner surface of the cylinder" cap 9. Said spring 15 is made -of relatively great rigidity so that in the normal operation of the compressor the head 7 is held upon its seat 2() at all times and the valve disk 13 is held rigidly in position in the head, the clamp ing member being stationary relative to the head.

For the purpose of minimizing clearanceA For the purpose of assisting the valvel disk 13 in seating itself over the discharge ports 12, the clamping member 14 is provided in its under side .with an annular channel 27 forming a compression chamber into which' the compressed fluid flows in the operation of the compressor during the passage of fluid to the exhaust port in the upward stroke of the piston; and upon the downwardstroke of the piston, the' compressed fluid in said chamber exerts its force upon the upper side of the valve disk 13 to assist it in returning to its seat.

In the normal operation of the compressor the safety head 7 isfheld upon its 'seat 20 so that the compressed fluid is prevented from escaping from the cylinder to the port 11, around the lowerend of the safety head. Should, however, the degree of compression exceed a predetermined point of safety, the spring 15 will yield suiliciently to permit of such passage of the fluid. Assuming the operation to be normal, with the head held to its seat, the outward or compressing stroke of the compressor piston will force the compressed fluidv through the ports 12 by way of the grooves 26 1n the displacement plugs 25, and may possibly lift such plugs slightly in this operation. The com-- pressed fluid escaping from the ports 12 passes into the channel 23 and thence by way of the ports 16 and groove .17, to the exhaust port 11, a portion of the iuid entering the compression chamber 27 in the head. Immediately, therefore, upon the downward movement of the piston, the spring disk assisted by the compressed fluid in the chamber 27, closes the ports 12 cutting 0H communication between the cylinder and the exhaust port.

-It will be seen that I have provided a safety head and discharge valve of a very simple and compact construction but which is at the same time eliicient in operation and durable. Moreover, the danger of parts sticking, preventing proper operation, and that parts of the device will work loose, is effectively obviated.

I claim as my invention l; In an ammonia compressor, the combination with a cylinder provided. with anv inlet port and having a chamber provided'A with an exhaust port, of a cup-shaped head mounted in the chamber, a series of ports in the end of said head opening into the cylinder, a second series of ports in the side wall of said head, valve means withinsaid head forcontrolling the ports in the end wall thereof, a clampingmember for said valve means mounted withinsaid head, said clamping member and head being shaped to provide at oppositeends of the ports in the side wall thereof annular channels, the inner one of which is adapted to receive fluid from' the ports in the end wall of the head and the outer one of which communicates with said exhaust port.

2. In an ammonia compressor, the combination with acylinder having a chamber provided with an exhaust port, of a head mounted in said chamber and having ports for establishing communication between the cylinder ,and the exhaust port, a resilient.

valve disk within said head for controlling certain of said ports, and Ia clamping mem ber for said disk having Va'central stud 6r boss with which the head is arranged to interengage, said disk having an aperture I forreceiving said boss, and the lower face of said clamping member being cone-sha ed to permit the movement of the valve 'sk under pressure.

3. In an ammonia compressor, the combination with a cylinder having a chamber in its upper portionprovided with an exhaust port, of a head mounted in said chamber so as to normally close the upper end of the cylinder, means establishing communication through said head between the cylinder and the exhaust port, means comprising a resilient disk valve member for controlling such communication, a clamping member coacting with the head to hold said valve member imposition, and a. compression spring bearing between the outer cylinder head and A said clamping member.

4. In an ammonia com' ressor, the combi- I nation of a combined sa ety head anddi's charge valve including a cu -shaped member mounted at one end o the cylinder, valve-controlled means within the' head for providing a way of escape for pressure vfluid nation with a cylinder, lof a head in the Y form of a cup-shaped member provided in its bottom wall with a plurality of portal and `having clamped on the outer side of said wall a resilient disk for controlling the liow `of pressure fluid from the cylinder, said disk being secured in position by a spring pressed clamping member.

6. In an ammonia compressor, the combination With a cylinder, of a head for closing one end of the cylinder, said head being cup-shaped in form and having a series of ports in its bottom Wall, and a valve member Vsecured on said Wall for controlling said ports, said ports having plugs therein With passageways formed therein for the passage of pressure fluid through the ports While the plugs are in position.

7. In an ammo-nia compressor, the combination With a Cylinder, of a head closing one Aend of the cylinder comprising a cupshaped member having ports forming a passage-Way for pressure fluid from the cylinder, a valve disk in the head adapted to close certain of said ports, a member above the valve member stationary with reference to the head, said member being provided with a fluid compression chamber above said valve disk and communicating With the passage-Way for the pressure fluid.

8. In an ammonia compressor, the combination of a cylinder having an outer head, and having a piston chamber with an auX- iliary chamber made of slightly greater diameter so as to form an annular seat, a safety head Within said chamber and having one end resting upon said seat, a compres- 'sion spring bearing at one end upon the outer head of the cylinder, and a member interposed between said spring and said safety head, said member-having an annular flange forming a seat for the spring and pressing said safety head to its seat.

9. In an ammonia compressor, a cylinder having a fixed outer head, a piston chamber, and an auxiliary chamber between'the piston chamber and said head and having an exhaust port, a safety head mounted Within said ,auxiliary chamber, valve-con` trolled means establishing communication between the piston chamber and said eX- haust port including a liat resilient valve member carried by the safety head, and a single spring means for clamping the Safety head and the valve member in position.

In testimony whereof, I ,have hereunto set my hand.

GEORGE HILGER. 

